Fix title menu tileset layering error

[ShnitzelX2]

Summary

Bugfixes "Fix title menu tileset layering error"

Purpose of change

• Closes Changing tileset on the main menu moans about layering ids not existing #78592

Describe the solution

Refreshing tiles only should happen in-game, so now refreshing tiles from the options menu checks if core data is loaded.

This also makes switching tilesets on the title screen much faster.

Describe alternatives you've considered

Testing

Changed the tileset in-game and on the title menu according to the issue, no errors.

As recently reported, Tiles = false is currently segfaulting the game, so I can't test that right now

Additional context